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SCHOOL principals have hired security firms to patrol their grounds as they crack down on traditional end-of-year "muck-up day" celebrations.

Schools have been forced to take extreme measures to guard their grounds and students for fear of property vandalism and general risky behaviour.

At least six SA schools, including St Peters College, Brighton High and Sacred Heart College Senior, hired security guards to patrol their grounds this week as the official Year 12 school year comes to an end.

Brighton High School principal Olivia O'Neill said the school had "zero tolerance" for the celebrations.

"We tell our students there is no such thing as muck-up day, in the minds of some students (from other schools) there is and they may take the risk to leave a mark before they leave (school)," she said yesterday.

"The security guard might invariably find students from other schools who are coming in and damaging schools."

A stern two-page letter obtained from Sacred Heart College Senior principal Dr Paul Hine, warns Year 12 parents and students about the ramifications of defacing school property and insulting school teachers.

"Students and families do not need conflict with police, school authorities or members of the public during the intensive assessment stage of Year 12," the letter says.

Pranks in previous years have included a pig's head being brought to school, offensive behaviour, which was filmed, vandalism and girls streaking in their underwear.

A Department of Education spokeswoman said they had received requests for additional security from two schools, which was arranged by the department at the school's cost.

A SAPOL spokeswoman said they would be ready to respond today if needed.

"South Australian Police are urging students to act responsibly this muck-up day and ensure their celebrations don't get out of control," she said.

Catholic Education SA director Dr Paul Sharkey said he was aware of a number of schools who used extra security at this time of year.

He said harmless pranks could often turn bad quickly.

"It may be meant in fun ... but things that start out in being not maliciously motivated can have poor effects to all involved," he said.

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